Autonnic A5023 Manuale d'uso e d'installazione - Pagina 11

Sfoglia online o scarica il pdf Manuale d'uso e d'installazione per Bussola Autonnic A5023. Autonnic A5023 19. Fluxgate compass

our investigation show that there is always a residual error due to the fact

that real magnetic objects do not behave exactly according to the model

outlined. Autonnic is aware that the need for a constant angular velocity

is onerous but the benefit is that it provides a very low residual error –

less than 0.5°.

Note that the calibration is different if the unit is mounted upside-down.

Calibration must always be done with the unit in its final mounted

position. The essential point of the calibration is remove the influence of

external magnetic components in the vicinity – the nearby pieces of iron

and steel –so it is essential that these remain unchanged after calibration.

If any significant iron component is altered – such as the installation of

new equipment or replacement of equipment such as winches or engines

– then the calibration must be re-done.

4.3

Terminating a bad calibration

If the process is faulty in any way – such as would happen if the

manoeuvre cannot be completed, the process can be terminated by the

NMEA command (see 5.2.17) and the original factory default (linear) table

is restored. Alternatively, this can be done by pressing both Switches

together for at least 1 second.

NOTE that there should be a delay of at least 5 seconds after termination

before a new calibration process is initiated.

4.4

Setting reference NORTH heading

Switch 2 (and also a NMEA command) is provided to set 'zero'. The

compass should

first be auto-calibrated

then be aligned to North

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